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修改這篇文章 : When to add superplasticizer?

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Polycarboxylic acid water reducer is a new type of admixture, which has a higher water reduction rate than naphthalene series, better slump retention performance, and has a certain air entrainment, and less concrete shrinkage, use Of course, it is necessary to do experiments first to avoid bleeding due to excessive parameters. When should the polycarboxylic acid water reducer be added? Water-reducing agent in concrete is mainly based on physical properties, such as adsorption, space effect to prevent the flocculation of cement particles. As the cement hydration progresses, the water-reducing agent molecules will be wrapped up by the cement product and lose the water-reducing effect. As long as the concrete has plasticity, water reducing agent can be added. The newly added water-reducing agent can be adsorbed on the surface of cement to provide water-reducing effect It can be added twice. When the slump loss is too fast to guarantee the normal pouring construction, you can add an appropriate amount (preferably tested) before the pouring and mix it evenly after construction. You can also add less water as long as you guarantee the water Do not change the glue ratio too much (requires data accumulation), it will not have a great impact on quality.Powder water reducer is added together w

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